9
English
2 Safety Notes
The amplifier module corresponds to all relevant
directives of the EU and is therefore marked
with .
WARNING
The module uses dangerous
mains voltage. Install the module
before connecting it to the mains;
otherwise you will risk an electric
shock.
•
The module is suitable for indoor use only.
Protect it against dripping water and splash
water, high air humidity and heat (admissible
ambient temperature range 0 – 40 °C).
•
Do not operate the module or immediately
disconnect the mains plug from the socket
1. if the module or the mains cable is visibly
damaged,
2.
if a defect might have occurred after the
unit was dropped or suffered a similar ac-
cident,
3. if malfunctions occur.
In any case the module must be repaired by
skilled personnel.
•
Never pull the mains cable to disconnect the
mains plug from the socket, always seize the
plug.
•
For cleaning only use a dry, soft cloth; never
use water or chemicals.
•
No guarantee claims for the module and no
liability for any resulting personal damage or
material damage will be accepted if the mod-
ule is used for other purposes than originally
intended, if it is not correctly installed or op-
erated, if it is modified or if it is not repaired
in an expert way.
If the module is to be put out of oper-
ation definitively, take it to a local re-
cycling plant for a disposal which is not
harmful to the environment.
3 Applications
This amplifier module is designed for installa-
tion into a subwoofer speaker cabinet which is
used to complement existing speaker systems
with low frequencies when a convincing bass
reproduction is required.
The module is provided with a low-pass filter
with adjustable cut-off frequency (40 – 200 Hz)
and a control to correct the phase in combina-
tion with other speakers. The amplifier has a
limiter to protect the speaker.
The power amplifier is designed as a class
Damplifier. It is supplied with power from a
switch-mode power supply. Thus, it has an extra
high efficiency at a low weight.
Instead of connecting the module to sig-
nal sources with line level, it is also possible to
connect it to the speaker outputs of a power
amplifier.
4 Installation and Connection
WARNING
When installing the amplifier
module, always disconnect it
from the mains. For operation,
the module must always be in-
stalled; otherwise you will risk an
electric shock.
1) To install the module, saw a suitable cutout
(approx. 225 mm × 248 mm) into the speaker
cabinet.
2)
Only connect speakers or speaker systems
with a total impedance of at least 4 Ω. Con-
nect the speaker via the two cables coming
from the PCB. Always observe the correct
polarity: connect the positive pole of the
speaker to the red cable (marked “SP+” on
the PCB); connect the negative pole to the
black cable (marked “SP–” on the PCB).
3) Insert the module into the speaker cabinet.
Make sure that there is sufficient space for
the module inside the cabinet and that there
is no risk of contact with other electrocon-
ductive components or heat-sensitive mate-
rials. When the front plate is not recessed,
the required mounting depth is 76 mm. Do
not stretch or squeeze the connection cables.
4)
Use eight screws (∅ 4 mm) to fasten the front
plate of the module to the cabinet.
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